In flash column chromatography the most commonly used stationary phases are silica gel (SiO 2) and alumina (Al 2 O 3). Other stationary phases are available for specific uses (Table 1). Figure 2 shows the general structure of normal phase, reversed phase and specialized silica.
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(215)640-1000. Claims (800)433-0385. ACE USA, the U.S.-based retail operating division of the ACE Group of Companies, offers more than 170 sophisticated property, casualty, risk-management, and accident and health insurance products and services through retail brokers.ACE American Insurance Company has offices in 18 U.S. cities.This info was last verified on 8/26/2010. If this information is incorrect please contact us and let us know so that we can make any required changes.CE American Insurance Company has offices in 18 U.S. cities. This info was last verified on 8/26/2010. If this information is incorrect please contact us and let us know so that we can make any required changes.